the ad in the paper, he finds himself in one of the diving capitals of the world, 30 miles outside of capetown at the southernmost tip of south africa, staring at a shark cage. >> you're shaking your head, looking at it, thinking, wow, that thing is so small. if one of these sharks wanted to get into it, there was no stopping it. >> and as jerry sizes up the shark cage, he notices an even bigger concern. >> i kind of remembered noting that it seemed like there was a big hole. big holes around the side there. they had mentioned that they had removed a bar so a camera crew could swim in and out of it and they actually hadn't put it back. >> jerry thinks that that hole looks big enough for a shark to get through but captain assures him he'll be safe, so he nods cautiously and boards the boat. after all he didn't come halfway around the world to miss out on seeing great white sharks. and when, out at sea, he finally gets a look at one of these massive creatures, he understands why the captain isn't concerned about that little gap between the bars. >> this thing looked like a submarine. it was huge